PSI - Issue 33

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Procedia Structural Integrity 33 (2021) 229–236

IGF26 - 26th International Conference on Fracture and Structural Integrity Study of the durability of concrete mixed with polypropylene fibers Hassan Suiffi a, * , Anas El Maliki a , Omar Cherkaoui b , Mohamed Dalal b I F26 - 26th International Conference on Fracture and Structural Integrity tudy of the durability of concrete ixed ith polypropylene fibers assan Suiffi a, * , nas El aliki a , ar herkaoui b , oha ed alal b

a Control and Mechanical Characterization of Materials and Structure Laboratory (LCCMMS), National Higher School of Electricity and Mechanics, Hassan IIUniversity, Casablanca, Morocco b Laboratory on textile materials REMTEX, Higher School of Textile and Clothing Industries, Casablanca, Morocco a Control and Mechanical Characterization of Materials and Structure Laboratory (LCCMMS), National Higher School of Electricity and Mechanics, Hassan IIUniversity, Casablanca, Morocco b Laboratory on textile materials REMTEX, Higher School of Textile and Clothing Industries, Casablanca, Morocco

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo For these durability tests, the composite was tested with different strengths of polypropylene fibers (0.05%, 0.10%, 0.30% and 0.50%). The results showed that the addition of polypropylene fibers in a cement matrix does not affect the durability of the composite but increases its resistance to fire , which favors its use in structures exposed to fire risks. © 2021 The Authors. Published by ELSE IER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Polypropylene fibers; concrete; porosity;gas permeability; diffusivity; durability. Abstract In order to study the durability of cementitious composites with polypropylene fibers, several experimental tests have been carried out. In this study, the durability was studied using three major indicators which can be summarized in: the porosity accessible to water ε b , the permeability to K app.gas oxygen and the D ns diffusivity. The porosity test was carried out to evaluate the absorption rate which remains significant compared to concrete without fibers; the chloride permeability test was carried out to assess the permeability of the concrete and the diffusivity test to determine the resistance of the composite to aggressive chemical agents. Test results revealed that all mixtures had low to very low chloride permeability. The increase in porosity for the different strengths with polypropylene fibers ranged from 1.50% to 3.75% compared to the reference mixture. For these durability tests, the composite was tested with different strengths of polypropylene fibers (0.05%, 0.10%, 0.30% and 0.50%). The results showed that the addition of polypropylene fibers in a cement matrix does not affect the durability of the composite but increases its resistance to fire , which favors its use in structures exposed to fire risks. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Polypropylene fibers; concrete; porosity;gas permeability; diffusivity; durability. Abstract In order to study the durability of cementitious composites with polypropylene fibers, several experimental tests have been carried out. In this study, the durability was studied using three major indicators which can be summarized in: the porosity accessible to water ε b , the permeability to K app.gas oxygen and the D ns diffusivity. The porosity test was carried out to evaluate the absorption rate which remains significant compared to concrete without fibers; the chloride permeability test was carried out to assess the permeability of the concrete and the diffusivity test to determine the resistance of the composite to aggressive chemical agents. Test results revealed that all mixtures had low to very low chloride permeability. The increase in porosity for the different strengths with polypropylene fibers ranged from 1.50% to 3.75% compared to the reference mixture.

* Corresponding author. Tel.: +212-661-412071. E-mail address: suiffi@gmail.com * Corresponding author. Tel.: +212-661-412071. E-mail address: suiffi@gmail.com

2452-3216© 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216© 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.028